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Business and summary of significant accounting policies - New Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Item Effected [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets, net | $ 8,644 |  |  |  | $ 11,058 |  |  |  | $ 8,644 | $ 11,058 |
Deferred income tax liabilities, net | 16,813 |  |  |  | 6,546 |  |  |  | 16,813 | 6,546 |
Net income attributable to MAXIMUS | $ 50,743 | $ 52,225 | $ 48,785 | $ 26,609 | $ 35,437 | $ 41,666 | $ 38,808 | $ 41,861 | 178,362 | 157,772 | $ 145,440
Stock compensation tax benefit |  |  |  |  |  |  |  |  | 5,172 | 9,474 | 9,665
Cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 180,026 | 206,217 | 213,600
Cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | $ 96,842 | $ (111,115) | $ 127,144
Diluted earnings per share attributable to MAXIMUS (in dollars per share) | $ 0.77 | $ 0.79 | $ 0.74 | $ 0.40 | $ 0.53 | $ 0.62 | $ 0.58 | $ 0.63 | $ 2.69 | $ 2.35 | $ 2.11
Previously reported |  |  |  |  |  |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset, current |  |  |  |  | $ 19,000 |  |  |  |  | $ 19,000 |
Deferred tax assets, noncurrent |  |  |  |  | 700 |  |  |  |  | 700 |
Deferred tax liabilities, noncurrent |  |  |  |  | $ 15,200 |  |  |  |  | $ 15,200 |
Pro Forma |  |  |  |  |  |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share attributable to MAXIMUS (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.76 |  |
Accounting Standards Update 2016-09 | Pro Forma |  |  |  |  |  |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MAXIMUS |  |  |  |  |  |  |  |  | $ 5,172 |  |
Cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 5,200 |  |
Cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | $ 5,200 |  |
Diluted earnings per share attributable to MAXIMUS (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.07 |  |

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